Docs img now with min-width + CSS classes for reuse

[tadeubas]

What is this PR for?

• Docs img for simulator screenshots of Amigo and M5stickv now have min-width
• Created CSS classes to reuse in simulator imgs
• Remove old unused snippets
• Updated imgs on project README

What is the purpose of this pull request?

• Bug fix
• New feature
• Docs update
• Other

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.86%. Comparing base (fc0e661) to head (0d847a3).
Report is 15 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #514   +/-   ##
========================================
  Coverage    94.86%   94.86%           
========================================
  Files           75       75           
  Lines         8361     8361           
========================================
  Hits          7932     7932           
  Misses         429      429           

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[odudex]

Great improvement!